Use hard-coded file list instead of Dir.glob.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63377 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/csv/csv.gemspec

@@ -13,8 +13,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://github.com/ruby/csv"
   spec.license       = "BSD-2-Clause"
 
-  spec.files         = Dir.glob("lib/**/*.rb")
-  spec.files         += ["README.md", "LICENSE.txt", "news.md"]
+  spec.files         = ["lib/csv.rb", "lib/csv/table.rb", "lib/csv/core_ext/string.rb", "lib/csv/core_ext/array.rb", "lib/csv/row.rb", "lib/csv/version.rb", "README.md", "LICENSE.txt", "news.md"]
   spec.require_paths = ["lib"]
   spec.required_ruby_version = ">= 2.3.0"